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diff --git a/develop/admin_api/account_validity.html b/develop/admin_api/account_validity.html
index cafea79756..f6552ca2df 100644
--- a/develop/admin_api/account_validity.html
+++ b/develop/admin_api/account_validity.html
@@ -147,6 +147,7 @@
                         </div>
 
                         <h1 id="account-validity-api"><a class="header" href="#account-validity-api">Account validity API</a></h1>
+<p><strong>Note:</strong> This API is disabled when MSC3861 is enabled. <a href="https://github.com/matrix-org/synapse/pull/15582">See #15582</a></p>
 <p>This API allows a server administrator to manage the validity of an account. To
 use it, you must enable the account validity feature (under
 <code>account_validity</code>) in Synapse's configuration.</p>